Imaging lens assembly, image capturing apparatus and electronic device

Abstract

An imaging lens assembly includes, in order from an object side to an image side, a first lens element and a second lens element. The first lens element includes a first frustum surface and a second frustum surface. The first frustum surface is disposed on a side of the first lens element facing towards the second lens element. The first frustum surface and the second frustum surface are disposed on the same side and coaxial, and the second frustum surface is closer to an optical axis than the first frustum surface to the optical axis. The second lens element includes a first corresponding frustum surface and a second corresponding frustum surface. The first corresponding frustum surface is corresponding to the first frustum surface. The second corresponding frustum surface is corresponding to the second frustum surface.

What is claimed is: 
     
       1. An imaging lens assembly comprising, in order from an object side to an image side, a first lens element and a second lens element, and an optical axis passing through the first lens element and the second lens element;
 wherein the first lens element comprises:
 a first frustum surface disposed on a side of the first lens element facing towards the second lens element, and the optical axis being an axis of the first frustum surface; and 
 a second frustum surface, the first frustum surface and the second frustum surface disposed on the same side and being coaxial, and the second frustum surface closer to the optical axis than the first frustum surface to the optical axis; 
 
 wherein the second lens element comprises:
 a first corresponding frustum surface corresponding to the first frustum surface; and 
 a second corresponding frustum surface corresponding to the second frustum surface; 
 
 wherein when an environmental temperature is T1, the first frustum surface is directly contacted with the first corresponding frustum surface, the second frustum surface and the second corresponding frustum surface are disposed at intervals, and the first lens element is aligned to the second lens element; when the environmental temperature is T2, the second frustum surface is directly contacted with the second corresponding frustum surface, the first frustum surface and the first corresponding frustum surface are disposed at intervals, the first lens element is aligned to the second lens element, and the following condition is satisfied:
   5 K≤| T 1− T 2|≤200 K.
 
 
 
     
     
       2. The imaging lens assembly of  claim 1 , wherein on a cross section perpendicular to the optical axis and passing through the first frustum surface, the first corresponding frustum surface, the second frustum surface and the second corresponding frustum surface, a nearest distance between the first frustum surface and the second frustum surface is D, a shortest distance between the first corresponding frustum surface and the second corresponding frustum surface is d, and the following condition is satisfied:
   0.2 μm≤| D−d|≤ 19.8 μm.
 
 
     
     
       3. The imaging lens assembly of  claim 1 , wherein at least one of the first lens element and the second lens element further comprises an outside surface, the outside surface is farther from the optical axis than the first frustum surface, the first corresponding frustum surface, the second frustum surface or the second corresponding frustum surface from the optical axis, and a light blocking layer of the imaging lens assembly covers at least one portion of the outside surface. 
     
     
       4. The imaging lens assembly of  claim 1 , further comprising:
 a lens carrier accommodating the first lens element and the second lens element, and comprising an inside surface, wherein the inside surface faces towards and surrounds the first lens element and the second lens element; 
 wherein one of the first lens element and the second lens element and the lens carrier are disposed at intervals. 
 
     
     
       5. The imaging lens assembly of  claim 1 , wherein the first lens element and the second lens element have different coefficients of linear thermal expansion, the coefficient of linear thermal expansion of the first lens element is E1, the coefficient of linear thermal expansion of the second lens element is E2, and the following condition is satisfied:
   0.005≤|( E 1− E 2)/( E 1+ E 2)|≤0.95.
 
 
     
     
       6. The imaging lens assembly of  claim 1 , wherein an angle between the first frustum surface and the second frustum surface on a cross section parallel to the optical axis is θ, and the following condition is satisfied:
   10 degrees≤θ≤90 degrees.
 
 
     
     
       7. The imaging lens assembly of  claim 1 , wherein the first lens element further comprises a receiving surface facing towards the second lens element and substantially perpendicular to the optical axis;
 wherein the receiving surface keeps being directly contacted with the second lens element when the environmental temperature is between T1 and T2. 
 
     
     
       8. The imaging lens assembly of  claim 1 , wherein one of the first lens element and the second lens element comprises at least one reduction surface reducing from a side of the one of the first lens element and the second lens element away from the optical axis towards a direction close to the optical axis. 
     
     
       9. The imaging lens assembly of  claim 1 , wherein one of the first lens element and the second lens element is a reflective lens element, the reflective lens element along an imaging light path comprises an incident surface, at least one reflective surface and an exit surface, and the imaging light path is folded on the at least one reflective surface towards a mirror direction;
 wherein at least one of the incident surface and the exit surface comprises an axisymmetric surface, the imaging light path passes through the axisymmetric surface, and the axisymmetric surface and the first frustum surface are coaxially disposed on the optical axis. 
 
     
     
       10. The imaging lens assembly of  claim 9 , wherein the incident surface, the at least one reflective surface and the exit surface of the reflective lens element are integrally formed via a plastic injection. 
     
     
       11. The imaging lens assembly of  claim 9 , wherein the reflective lens element further comprises a reflective surface element and an optical surface element, the at least one reflective surface is formed on the reflective surface element, and the at least one of the incident surface and the exit surface is formed on the optical surface element. 
     
     
       12. The imaging lens assembly of  claim 11 , wherein the reflective lens element further comprises a glue bonded the reflective surface element and the optical surface element. 
     
     
       13. An imaging lens assembly comprising, in order from an object side to an image side, a first lens element and a second lens element;
 wherein the first lens element comprises:
 a first frustum surface disposed on a side of the first lens element facing towards the second lens element, and an optical axis being an axis of the first frustum surface; and 
 a receiving surface, the first frustum surface and the receiving surface disposed on the same side, the receiving surface substantially perpendicular to the optical axis, and the receiving surface directly contacted with the second lens element; 
 
 wherein the second lens element comprises:
 a corresponding frustum surface disposed on a side of the second lens element facing towards the first lens element, and corresponding to the first frustum surface; 
 
 wherein when an environmental temperature is between T1 and T2, a spacing between the first frustum surface and the corresponding frustum surface changes according to the environmental temperature and is recoverable, and the receiving surface and the second lens element keep being directly contacted; when the environmental temperature is T1, the first frustum surface and the corresponding frustum surface are disposed at intervals; when the environmental temperature is T2, the first frustum surface is directly contacted with the corresponding frustum surface, the first lens element is aligned to the second lens element, and the following condition is satisfied:
   5 K≤| T 1− T 2|≤200 K.
 
 
 
     
     
       14. The imaging lens assembly of  claim 13 , wherein when the environmental temperature is a random temperature between T1 and T2, on a cross section perpendicular to the optical axis and passing through the first frustum surface and the corresponding frustum surface, a shortest distance between the first frustum surface and the corresponding frustum surface is D′, and D′ is not larger than 19.8 μm; when the environmental temperature is between T1 and T2, a maximum shortest distance between the first frustum surface and the corresponding frustum surface is D′max, and D′max is not less than 0.2 μm. 
     
     
       15. The imaging lens assembly of  claim 13 , wherein the first lens element further comprises a second frustum surface facing towards the second lens element; when the environmental temperature is T1, the second frustum surface is directly contacted with the second lens element;
 wherein an angle between the first frustum surface and the second frustum surface on a cross section parallel to the optical axis is 0, and the following condition is satisfied:
   10 degrees≤θ≤90 degrees.
 
 
 
     
     
       16. The imaging lens assembly of  claim 13 , wherein at least one of the first lens element and the second lens element further comprises an outside surface, the outside surface is farther from the optical axis than the first frustum surface, the receiving surface or the corresponding frustum surface from the optical axis, and a light blocking layer of the imaging lens assembly covers at least one portion of the outside surface. 
     
     
       17. The imaging lens assembly of  claim 13 , further comprising:
 a lens carrier accommodating the first lens element and the second lens element, and comprising an inside surface, wherein the inside surface faces towards and surrounds the first lens element and the second lens element; 
 wherein one of the first lens element and the second lens element and the lens carrier are disposed at intervals. 
 
     
     
       18. The imaging lens assembly of  claim 13 , wherein one of the first lens element and the second lens element is a reflective lens element, the reflective lens element along an imaging light path comprises an incident surface, at least one reflective surface and an exit surface, and the imaging light path is folded on the at least one reflective surface towards a mirror direction;
 wherein at least one of the incident surface and the exit surface comprises an axisymmetric surface, the imaging light path passes through the axisymmetric surface, and the axisymmetric surface and the first frustum surface are coaxially disposed on the optical axis. 
 
     
     
       19. The imaging lens assembly of  claim 18 , wherein the reflective lens element further comprises a reflective surface element and an optical surface element, the at least one reflective surface is formed on the reflective surface element, and the at least one of the incident surface and the exit surface is formed on the optical surface element;
 wherein the reflective lens element further comprises a glue bonded the reflective surface element and the optical surface element. 
 
     
     
       20. The imaging lens assembly of  claim 19 , wherein one of the first lens element and the second lens element comprises at least one reduction surface reducing from a side of the one of the first lens element and the second lens element away from the optical axis towards a direction close to the optical axis. 
     
     
       21. An electronic device, comprising:
 at least one of the image lens assembly of  claim 1 ; and 
 an image sensor disposed on an image surface of the imaging lens assembly. 
 
     
     
       22. An electronic device, comprising:
 at least one of the image lens assembly of  claim 13 ; and 
 an image sensor disposed on an image surface of the imaging lens assembly.